用非零偏P-P波、P-SV波计算零偏反射纵波和反射横波

Calculating the Zero Offset P and S R eflection Using the Nnoe-Zero Offset P-P and P-SV Wave

在P波入射时 ,地下同一点产生的P P波和P SV波是入射角、界面两侧纵波阻抗和横波阻抗的函数 ,并且两者是耦合的 .利用两者的耦合关系 ,可在入射角确定的情况下提取与入射角无关的零偏纵波反射和横波反射 .本文对此进行了理论推导 ,结论是 :入射角为零时的纵波与横波反射系数是入射角非零时的P P波和P SV波反射系数的线性组合 .进而可以用纵横波反射计算泊松比反射剖面 .把多波叠前反演转化到叠后进行 ,通过合成弹性参数反射剖面 ,直接反演弹性参数等 ,都很有意义 .文中给出了有关的公式 ,并对具体实现方法和有关参数进行了讨论 .

When P wave incidents,The P-P wave and P-SV wave created from the same point are both functions of incidence angle,and of the media above and below the interface,V p and V s they are coupled.Using this kind of coupled relationship,the zero-offset P wave reflection and S wave reflection,which don't depent on the incidence angle,can be obtained with the incidence angle determined,In this paper the theoretical deduction is carried out and the following concusion is obtained:the reflection coefficient of P wave and S wave when the incidence angle is zero is the linear combination of with none-zero incidence angle.Furthermore,the reflection of Poisson's can be calculated using P wave and S wave reflection.They are all meanjngful to transform the multi-wave prestack inversion into poststack,and directly invert elastic parameters.In the paper,the implementatio methods and the relative formulation are also discussed.